SI Joint Pain is the result of one of many different terms for sacroiliac (SI) joint dysfunction, including sacroiliac joint disorder, sacroiliac joint syndrome, sacroiliac joint strain and sacroiliac joint inflammation. Each of these terms refers to a condition that causes pain in the sacroiliac joints and results in lower back pain and/or leg pain.
The sacroiliac joint connects the triangular bone at the bottom of the spine (the sacrum) with the pelvis. As with most other joints in the body, the sacroiliac joints have a cartilage layer covering the bone which allows for some movement and acts as a cushion between the bones. When this cartilage is damaged or worn down, the bones begin to rub on each other. As with other weight-bearing joints of the body, this can lead to osteoarthritis.